The importance of referring sites.

As well as the content of the link, search engines take into account of what sites link refers.if the page references where relevant link to the target site has something to do with the target site and whether the target content relevant to the content of which is referenced.

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The importance of refers sites.

Example: If the page is to sell cars, then it will be much more important link, who will lead to such a page from a site about car repairs than a link that leads from the site about cooking.

It is obvious that the simple number of backlinks not give any evaluation criterion. It is necessary to take into account the importance of the connection as well as the number of inbound links.

Search engines use the term citation index for assessing the number and quality of back links to the site. Citation index is a numerical estimate of the popularity sources expressed as an absolute value representing page importance. Each search engine uses its own algorithm for estimating the index page citation. These values ​​search disclosed.

Citation index specifies the relative popularity of sites given the popularity of other sites on the Internet.